Liquid-tight joint for preventing leakage between the terminal rods and covers of electric accumulators



A. DININ. I

LIQUID TIGHT JOINT FOR PREVENTING LEAKAGE BETWEEN THE TERMINAL RODS AND COVERS 0F ELECTRIC ACCUMULATOR S.

APPLICATION FILED SEPT. 4 I918- 1,379, 854. rammed-Ma 31, 1921.

ALFRED DININ, OF NAN'IERRE, FRANCE.

LIQUID-TIGHT JOINT FOR PREVENTING LEAKAGE BETWEEN THE TERMINAL AND GOVERSOF ELECTRIC ACCUMULATORS.

RODS

Specification of Letters latent. I Patented May 31, 1921.

Applicationfiled September 4, 1918. Serial No. 252,669.

To all whom it may concern:

Be it known that I, ALFRED DININ, a citizen of the French Republic, whose postoffice address is 18 Route de Cherbourg a Nanterre, Seine, France, have invented certain new and usefulImprovementsinLiquid- Tight Joints for Preventing Leakage Between the Terminal Rods and Covers of Electric Accumulators, of which the following is aspecification.

This invention provides an improved liquid-tight joint for preventing leakage of liquid between the terminal rods and the covers of electric accumulators especially those having celluloid containers.

In order that the liquid of electric accumulators may not leak or creep at the terminal rods it is necessa that absolutely impermeable joints be provided at the points where the rods go through the cover of the container. The joint generally adopted for this purpose consists of a thick hollow plug of India rubber which surrounds the terminal rod and is pressed into an aperture on the cover thus forming an impermeable joint. This method is more or less satisfactory from the point of view of impermeability, but in addition to the India-rubber being expensive it quickly deteriorates and becomes hard and brittle. The joint then becomes ineffective and leakages occur.

This device is moreover-rather cumbersome and difficult to carry out on very small elements.

The present invention is intended to obviate these disadvantages by effecting a satisfactory permanent impermeability with a simple and inexpensive joint. According to this invention the terminal rods are provided at the point where they pass through the cover of the container with a closely fitting celluloid tube combined with a collar of the same material which is adhesively attached to the cover in such a manner as to close the passage opening completely.

The annexed drawing given by way of example illustrates a practical form of this invention.

Figure 1 is a sectional elevation of.a terminal rod and of the cover of an accumulator container jointed together in accordance tube 2 is slightly less than the diameter of the aperture formed in the cover of the celluloid container.

The internal diameter of the tube 2 when cold is slightly less than the diameter of the rod-l so that by heating the tube 2 it may be expanded and forced on to! the rod 1, the subsequent contraction on cooling bringing about an adhesion as intimate. as possible. The rod 1 and tube 2 are then passed through the aperture on the celuloid cover of the container and the small interstice that remains between the tube 2 and the edge of the aperture in the cover is closed by means of a small celluloid collar 3 which is adhesively attached by the ordinary means to the cover 4 and to the tube 2. Thus an impermeable joint is produced preventing any leakage of liquid. The joint also is permanent.

It is obvious that other forms of construction might be adopted and the details of manufacture be varied without departing from the spirit of my invention.

claim:

A liquid tight joint for preventing leak-' age between the terminal rods and covers of electric accumulators consisting of a celluloid sleeve having an internal diameter which is less ,than the diameter of the terminal rod and is adapted to be expanded'by heat and to be passed over the terminal rodv it 7 shall shrink tightly on the rod, and a co luin a heated condition so that in coolin 

